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  • Question

  • The specific surface of spherical particles is given by (where D and ? are diameter and density of particle).


  • Options
  • A. The specific surface of spherical particles is given by (where D and ? are diameter and density of p
  • B. The specific surface of spherical particles is given by (where D and ? are diameter and density of p
  • C. The specific surface of spherical particles is given by (where D and ? are diameter and density of p
  • D. The specific surface of spherical particles is given by (where D and ? are diameter and density of p

  • Correct Answer
  •  

    • Mechanical Operations problems

    Search Results

    • 1. Apron conveyors are used for

    • Options
    • A. heavy loads & short runs.
    • B. small loads & long runs.
    • C. heavy loads & long runs.
    • D. none of these.
      • Discuss
    • 2. Which of the following is not used as a filter medium in case of corrosive liquids?

    • Options
    • A. Nylon
    • B. Glass cloth
    • C. Metal cloth of monel or stainless steel
    • D. Cotton fabric
      • Discuss
    • 3. Pine oil and cresylic acid are used as __________ in the froth floatation process.

    • Options
    • A. frother
    • B. collector
    • C. depressor
    • D. conditioner
      • Discuss
    • 4. Which of the following is not an industrial screening equipment?

    • Options
    • A. Sharpies centrifuge
    • B. Vibrating screen
    • C. Grizzly
    • D. Trommel
      • Discuss
    • 5. Sedimentation on commercial scale occurs in

    • Options
    • A. classifiers
    • B. thickeners
    • C. rotary drum filters
    • D. cyclones
      • Discuss
    • 6. Pick out the correct statement.

    • Options
    • A. Plastic chips are called non-cohesive solids.
    • B. Kick's crushing law is, P/m = K . ln
    • C. Communition is a generic term for size enlargement operation.
    • D. Energy required in kwh per ton of product, such that 80% of it passes through a 200 mesh screen, is called 'Work index'.
      • Discuss
    • 7. With increase in drum speed, in a rotary drum filter, the filtration rate

    • Options
    • A. increases
    • B. increases linearly
    • C. decreases
    • D. is not affected
      • Discuss
    • 8. Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

    • Options
    • A. Jaw crusher, Ball mill, Fluid energy mill
    • B. Ball mill, Jaw crusher, Fluid energy mill
    • C. Fluid energy mill, Jaw crusher, Ball mill
    • D. Fluid energy mill, Ball mill, Jaw crusher
      • Discuss
    • 9. The grinding in a hammer crusher takes place due to the

    • Options
    • A. attrition
    • B. impact
    • C. both (a) & (b)
    • D. neither (a) nor (b)
      • Discuss
    • 10. The cummulative mass fraction of particles smaller than size dj for a collection of Ni particles of diameter di and mass mi (i = 1, 2, 3, ...... ?) is given by

    • Options
    • A.
    • B.
    • C.
    • D.
      • Discuss

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